isogloss

isogloss

[ahy-suh-glos, -glaws]
noun
(in the study of the geographical distribution of dialects) a line on a map marking the limits of an area within which a feature of speech occurs, as the use of a particular word or pronunciation.

Origin:
< German (1892); see iso-, gloss2

isoglossal, adjective
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isogloss (ˈaɪsəʊˌɡlɒs)
 
n
a line drawn on a map around the area in which a linguistic feature is to be found, such as a particular pronunciation of a given word
 
iso'glossal
 
adj
 
iso'glottic
 
adj

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